The name "Black September" comes from the fighting between Palestinians and Jordanian officials in September 1970. This month was called "The Black September" because the Arabs fought against themselves instead of the Israelis. (See History of Jordan). The first action of the group was to assassinate the Jordanian Prime Minister, Wasfi Tel, on November 28, 1971. Wasfi Tel was instrumental in expelling the Palestinan fighters from Jordan in 1970-71.
Its most well-known act was the "Munich massacre", the kidnapping and killing of Israeli athletes during the 1972 Summer Olympics in Munich.
Other actions attributed to Black September include:
After 1974, when the Abu Nidal Organization split from the PLO, the Abu Nidal group started associating the "Black September" name with some of its actions. The PFLP also used the "Black September" name on some occasions. Most likely, these groups had little or nothing to do with the original Black September group.